Centrifugal roller-mill.



.No. 881,262. PATENTED MAR. 10,1293- A. RAYMOND, DEGD.

M. M. BARTELME, ADMINISTEATBIX.

i GENTRIFUGAL ROLLER MILL.

APPLICATION FILED SEPT. 26,1901. 3 BHBETBBHEETPL Ely-1 la a .11

WITNESSES IN VE N TOR No. 881,262. I PATENTED MAR. 10, 1908.

A. RAYMOND, DEGD.,

M. M. BARTELME, ADMINISTRATRIX. CENTRIFUGAL ROLLER MILL.-

PPLI'OATI PI A 0N LED SEPT 26,1901 3 SHEETS SHBET 2.

A770 NEYJ No. 881,262. PATENTED MAR. 10, 1908.

' A. RAYMOND, DEGD.

M. M. BARTELME, ADMINISTBATRIX. GENTRIFUGAL ROLLER MILL.

APPLIOATION FILED .26 1 01.

SEPT 9 3SHBEIS-SHEET s.

MENTOR A 770RNE Y6 wax-$24 mrsstr OFFiCE. f

ALBERT' RAYMOND, 0F omcAGo, ILLINOIS; MARY MBARTELME ADMINISTRATRIX 0F SAID ALBERT RAYMOND, DECEASED.

. cnirritfiuon. n nmamn.

Specification of Letters Patent. Application am September 26, 1901. Serial 80. 7am.

Patented March 10, 1908.

To all 'whom it may concern:

. Be it known that I, ALBERT RAYMOND, a citizen.- of the United States, residing at Chi-' cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Centrifugal Roller-Mills, of which'the followin is a specification;

My invention re ates to that class of pulverizing mills, in which aplurality of crushing rollers is suspended within, and adjacent to, a crushing-ring, said rollers being suspended from as ider whichis-carried by a rotating central s aft. v I

The object of my invention to provide a pulverizing mill of the class described, which shall more efficiently,;as well as more rapidly, reduce the material to be oplelrated u on to an im alpable powder and w ch sha be reliab e inoperation and easy of accessi".

Another object of my invention is'to provide the roller-shafts of such a device with bearings and 'ournal-boxes of such a construction as s all insure the most efficient and certain operation of the device, shall insure the continuous and adequate lubrica tion of the bearings of theroller-shafts, and shall, at the same time, effectively exclude dust, owderand other foreign substances from t e roller-shaft-bearings.

A further object of my invention is to prevent the escape of lubricating oil into the inter'ior, of the mill. I

These and such'other objects as may hereinafter ap car are attained by the devices illustrate in the accompanying drawings, in which-*- Figure 1 is a vertical'sectional view through a machine embodying my invention; .Fi 1 is an enlarged detail of thereturn' fee valve, the same bein taken at right angles to the line in which '0 esame part is shown in Fi 1.. Fig. 2 is a cross sectional view on the line 22 of Fig. 1, looking inthe direction indicated by the arrows. Fig. 3 is a cross-sectional view on the line 33 of Fig.

- 1, lookin in the direction indicated b' the i arrows.-

my improve roller'journal-' parts in the several figures of i shaft '8, and consequently the 'rolls 14, may

Referring'to the accom anying drawings,

1 indicates a rectangular ii tuting a base, upon which are mounted. suports 1 which carry the bowl or @base-rin 2. ounted upon a'n'annular shoulder wit in the base-ring 2 is a baselate 3, while bolted to the base-rin 2 and t e base-plate 3 is a castin "4, whic carries a bearing 5. Bolted to,-an depending from, the lower end of the casting 4 1s a step-box 6. Journaled within .one of the supports 1, at one side of the machine, is a drive-shaft 7, upon the inner end' of which is' mounted a gear-wheel'7 which meshes with the crown-gear 7 which isri 'dly secured to the main shaft 8 of the mac ine. The lower end of the main shaft 8 rests u on a series of alternately arranged -steel an bronze washers 8, 8, 8, the lowermost of which washers rests upon a disk or wash'er 6 which is non-rotatively mounted upon an adjusting screw 6, which is screwthreaded through the bottom of the stepb'ox 6. The bearing 5 and the washers 6 and 8, 8 and 8 are all arranged in an oil-chamber within the casting 4 and the step-box 6.

The crown-gear 7 rests upon a collar or shoulder 8 on the shaft 8. The bottom plate 3 is provided with a centrally disposed, upwardly extendin bearing-sleeve 3", which carries bearings 3 3, within which the shaft 8 rotates.

9 is a hub, which is rigidly secured to the shaft 8 and is carried upon 'a shoulder 8 on the shaftv 8. The downwardly depending portion of the hub 9 is enlarged so as to form a sleeve, which, at its lower end, carries a series of plows 29.

10 is a spider, which is rigidly secured to the hub 9 and is carried on an annular shoulder.9 on the hub 9. The spider 10 com prises a plurality of forked arms 10, within the forks of which are pivotally suspended roller-journal-boxes 11 upon trunnions 12. Mounted within the journal-boxes 11 are roller-shafts 13, carrying the crushing-rolls 14, which are dis o'sed within, and adjacent to, the crushing-ring 15. This crushing-ring is preferably in the'form of a truncated cone and is seated just within the upper edge of the bowl 2.

By .means of the adjusting-screw 6, the

amework const1- r1ng15 surrounding m be adjusted vertically so as to bring the rolls in proper position opposite the crushing- 16 is a cylindrical casing, which is bolted to an annular shoulder upon the up er edge of the bowl 2 and is provided at Its lower edge with an annular inwardly extending tapered shoulder 17, which rests upon the upper edge of the grinding ring 15 and holds 1t in position against dis lacement in an upward direction. Exten across the casing 16 is a horizontal air-duct 18leadin to a centrally disposed and depending air-quot 19, at the lower end of which is a disk 20, which disk is provided with a central perforation within'which is loosely fitted the upper end of the shaft 8. Tothe upper end 0 the casing 16 is secured a flarin or coneshaped SGCtlOIl. of casing 21 lea ing to a cylindrical ring 22, which is closed by a cap 23, through which is provided an escapeopening 24 leading to any suitable means for inducing a current of air such for instance, as the exhaust fan F shown in Fig. 1.

By means of tangentially arranged partitions 25, the bowl or ring 2 is provided with a series of tangential air-inlets 26 completely machine. These air-inlets lead from the interior of my machine to a housing 27 which is attached to and surrounds the bowl 2 and leads by a tangential connection 28 to anyrsuitable air sup ly.

The hub 9 is provided at its lower on with a series of plows 29,. correplponding in number with t e crushing-r0 These plows are provided with vertical ribs 29, which extend tangentially along the inner edges of the plows to points slightly inside of the crushing ring 15 and directly in front of the crushing-rolls 14. The floors or bases of the plows extend diagonally upward from a point adjacent to the upper surface of the ase-plate 3 to a point about midway of the height of the crushing-rollers 14.

Arranged within the cone-shaped portion 21 of the casing is a funnel or hopper 30, above which a tapered deflecting-ring 31 is sus ended from the cap 23. At the lower en of the hopper 30 is arranged a valve 32, comprising an inverted 'V-shaped base-plate 33, above the inclined sides of which are hung swinging valves 34. As the valve 32 is square and the hopper. 30 is round it is necessary to square the lower end of the hopper so as to make a joint between the hopper and the valve. In .order. to produce the square lower end on the hopper I provide the latter with an extension 30 which extension where it is connected to the lower end of the hopper is round and, where it is connected with the valve is square and in the drawing the lines 30 indicate the shoulders which are formed in squaring the lower end of the extension 30, of the hopper.

Arranged at one side of the casing 16 is a feed-opening or hopper 35, provided with a feeding and agitating device 36.

37 is an oilsupply-pi e which leads through the air-ducts 18 and 19 to a central oil-duct 38 within the shaft 8, from the bot- The bearing 5.is lubricated by oil supplied through the oil-pipe 41.

The operation of my device is as follows: Power being transmitted to the machine b means of the shaft 7 and gearing 7", the sha t 8 is caused to rotate and the hub 9 and spider 10 will rotate therewith, causing the crushing-rolls 14 to travel around within the ring 15, said crushing-rolls and their shafts 13 also rotating, while the plows 29, mounted upon the hub 9, will travel in unison with the crushing-rolls 14. The roller-journal-boxes 11 being pivot-allyvsuspended upon the trunnions 12 within the forked arms 10" of the s ider 10, the centrifugal force imparted to the rolls 14 will throw the rolls against the crushing-ring 15. It will also be noted that with the trunnions assing through journal boxes at the sides t ereof furthest from the central shaft, the crushing rolls will be so hung that they will hang normally with their crushing faces in contact with the crushing ring. At the same time, an air-blast is induced through the tangential connection 28 into the housing 27, and assing through the tangential openings 26 between the partitions 25, becomes a gyratory current as it enters thepulverizing-c-hamber below the rolls 14; and, still gyrating, passes upward within the casing 16, between the casing sec-- tion 21 and funnel 30, then is deflected by the ring 3]. and finally passes through the ring 31 and out at the discharge opening 24. The

-material to be crushed or pulverized, now

being fed to the machine through the hopper 35, is dropped directly upon, or in front of,

thecrushmg-rolls 14 and the plows 29. The

material fed in front of the plows is caught up by the broad forward edges of the plows and thence is directed by the plows to a point between the crushing-rolls and the crushing ring, between which it is ground and pulverized as it escapes from the narrow ends of the plows. mediately carried upward within the casing by the gyrating current of air, the gyrating current givingthe material a longer travel before escaping from the machine and thereby allowing more opportunity for the The material so crushed is im:

' carried away through the discharge opening 1o such material would seriously interfere with ,within the machine is again caught u by the 'securelyattached to the casing by stud-bolts necting upper and lower chambers.

uncrushed 'ortions to dro back within'the machine, w ile the more t oroughly crushed portions are carried 11 ward and over the up er edge of the funne 30,'at which oint the urther deflection and retarding o the air current will permit of the remaining coarser particles dropping within the funnel 30 while the thoroughly pulverized material is 24 to any suitable dust collector. The coarser particles dropped within the funnel 30 will pass through the valve 32 back to the crushing mechanism, the base 33 of the valve serving to direct such particles toward the crushing rolls. The material falling back plows 29 and thrown by the lows etween the crushing-rolls and the crus ingring until all the material has been thoroughly pulver ized. and carried away by the g ratory blast. The tendency .of the induced blast through the'an'achine will be to create an exhaust within the pulverizing-chamber, by virtue of which a current of air will be drawn inthrough the air-ducts 18, 19 and between the disk or collar 20- and the shaft 8, thereby insuring that material from the ulverizingchamber will not work through etween the collar 20 and the shaft 8, whence it might find its way into the oil-ducts and the shaftbearings.

It is evident from the foregoing description that, when my machine is in operation, the journal-boxes 11 are suspended in a cloud of. more or less finely pulverized material, and it has been found in practice that there is much diflicult in excluding such-finely powdered materia from the roller-journal-boxes, where the rotation of the roller-shafts 13. It has also been found that the problem of mounting the roller-shafts to the best advantage and keeping the same freely lubricated, without allowing oil to escape-intothe pulverizingchamber, has not been easy of solution.

My dustproof journal-boxfor the rollershafts is constructed as follows: 13 indicates a shaft, u on the lower end of which is rigidly mounte a crushing-roll 14. Keyed, or otherwise suitably attached, to theupper' end of the shaft '13, is a bearing-sleeve B, which supports and rotates with the shaft 13.- The lower flanged end of the sleeve B is suported,-and rotates, upon an end-thrust hearing C, which is mounted'within an annular shoulder (1 within the journal-casing D, while the sleeve B also rotates within a vertical bearing K, fitted within the upper portion of the casing D. The casing D is provided with a terminal cap E and a base-'ri F, which are G, so as to have a tigsht joint between the casing 1) and the cap and'base-ring F. The. interior of the casing D is divided into con-' Fitted at one end within the Jpassage begreater than the diameter of the shaft 13,.

which rotates freely within it. So also the passage bet-ween the upper and lower chambers of the casing D is of greater diameter than the diameter of the shaft 13. The

flanged end of the bearing-sleeve B and the end-thrust bearing C, upon which it rests, are located within an annular enlargement within the casing D, whereby an oil-chamber d isprovided, within which chamber the flanged end of the bearing-sleeve B rotates upon the end-thrust bearing. To facilitate the sup ly of oil to the bearing surfaces between tfie end of the sleeve B and the beari C,'I provide oil-ducts c through the flange 'end of the bearing-sleeve B. So also the annular space between the sleeve J and the bearing-sleeve B forms an oil-space or chamher, from which oil-ducts 7' lead to the bearing surfaces between the sleeve J and the bearing B. It will thus be seen that the upwardl wher y oil will at all times be maintained at such a height as to completely surround the bearings C and K, and there will be no escape of oil except when the supply of oil overflows the top of the sleeve or dam J, in which event it will flow down between the sleeve J and the shaft 13 and thence to the bearings in the lower chamber of the casing D. Further, by by reason of the rapid rotation of the sleeve B, the oil within the sleeve B will be thrown by centrifugal force through the duct 7',

whence it Wlll pass between the'bearing surfaces of the sleeve B and the bearing K into the oil-chamber d and back again through the ducts 0, thereby providing a circulation of the oil around the bearin 's. From time to time, as it maybe desire to remove the old oil and renew the sup ly of lubricating fluid, the old oil may be rawn off through the pet-cock L, and the new supply of oil fed through the feed-opening M.

Within the lower chamber of the casing D projecting sleeve J forms a dam,

is a second bearing arranged substantially as before described a bearing-sleeve B being rigidly secured to the shaft 13 and'rotating within a bearing K, which is fitted 'vrithin the lower portion of the casing D. The lower end of the bearing-sleeve B does not, however, rest u on any end-thrust bearing, the

weight of t e shaft and roller being carried by the bearing-sleeve B and end-thrust bearing C.

Surroundin the shaft 13 and extending upwardly wit in the bearing-sleeveK is a dam or sleeve J, which is flanged at its lower end, such flanged portion being securely clamped between the lower end of the the lower ortion of the casing is provided with an oi -feed-openin M and isalso provided at its lower en with the pet-cock L, from which old oil may be withdrawn. Rigidly mounted upon the shaft 13, at a point lmmediately below the base-ring F, is a deflector 'N for retardin the entrance of pulverized material into tie journal-box.

At one side the journal-box is rovided with an opening 0, within which is rigidly secured a trunmon 12, as shown in Fig. 2.

It will thusbe seen that, with a journalbex and bearing so constructed, not only may dust and other foreign substances be efliciently excluded, but a suflicient supply of oil may be maintained at all times withinv the journal-box to completely surround all of the bearings, so that they shall constantly rotate within chambers-filled with oil, while, at the same time, there will be no escape of oil from the journal-box into the interior of the pulverizing machine unless too great an amount of oil is fed to both the upper and lower bearings within the journalbox, as an excess fed to the upper bearing only will overflow into the lower bearing and adjacent oil spaces, which, in turn, must be filled to overflowing before any oil can escape from the journal-box.

It will further be observed that, with my journal-box constructed as shown in Fig. 4, there is room for a slight vertical play of the shaft 13 within the journal-box and the arrangement of the upper edge of the bearingsleeve B, with relation to the shoulder d "formed within the journal box, is such that said shoulder (i will act as a stop to the vertical movement of the shaft, thereby insuring that the base-ring F, the .dams and the bearings shall be protected against injury which might otherwise be caused, should the accidental inter osition of refractory material below the ro 1314 cause a sudden and violent vertical movement of the shaft 13.

Although I prefer the embodiment of my invention in the form shown in the drawings, obvious modifications thereof will occur to those skilled in the art. Such modifications, however, do not constitute a departure-from the spirit of my invention, but are contemplated thereby.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a crushing machine the combination with the main shaft, of a base late, a bearing sleeve carried by said base p ate, a bearing fitted within said sleeve, means for leading oil to said bearing, a hopper extending over said sleeve, and an overflow passage leading from said bearing to an opening through sai base late, substantially as described.

2. n a machine of the class described, the combination with the main shaft, of a base plate, a bearing-sleeve carried thereby, a

ing to said escape opening, substantially as 3 described.

3. In a machine of the class described, the

combination with the main shaft, of a spider, a journal box ivotally suspended from said spider, journa and thrust bearings mounted within said journal box, a bearing-sleevearranged to rotate within said journal-bearing and upon said thrust .bearing, a roll-shaft carried by said bearingsleeve, a dam arranged within said sleeve and a crushing-roll mounted upon said shaft, substantially as described.

4. In a machine of the class described, the combination with the main shaft, of a spider rigidly secured thereto, a closed journa box pivotally sus ended from said spider, a rollshaft suspen ed within said j ournal-box and arranged to rotate therein, annular oil-chambers within said j ournal-box and surrounding said roll-shaft, bearings for said roll-shaft arranged within said oil-chambers, an overflow from one of said oil-chambers to the other, means for supplyin oil to said oil-chambers, and a crushing-r01 ri idly secured to the lower end of said roll-s aft, substantially as described.

5. In a crushing machine the combination with the main shaft of an air inlet conduit, a disk at the lo'werend of said air inlet conduit, within which is loosely fitted said main shaft and an oil supply pipe leading through said air inlet conduit, substantially as described.

6. In an apparatus of the class described, the combination with a pulverizin chamber, of a main shaft extending upward y therein, a hollow support for the upper end of said main shaft, projecting downwardly into said chamber and loosely engagin the upper end of said shaft, an air inlet uct extendin transversely of said ulverizing chamber an leading to said holfbw sup ort and an oil supply pipe leading throug said air inlet duct, substantially as described.

7. In a device of the class described, a rollshaft mount-ing, comprising a journal box, an

end bearing mounted within said journal box, a bearing-sleeve, resting upon said end bearing and having a limited longitudinal play within said journal box, and a roll-shaft extending within said bearing-sleeve and keyed thereto, means for excluding dust from said forated plate and a flange extending subjournal-box, comprising a cap .upon the upstantiallydparallel with the lower ends of said 10 per end of said journal box, a perforated perforate plate. plate loosely closing the lower end of said 5 purnal-box and surrounding the roll-shaft, I

and a deflecting plate comprising a collar Witnesses! closely surrounding the roll-shaft and mount M. E. SHIELDS, ed thereon a short distance below said per E. Y. GRIDLEY.

ALBERT RAYMOND. 

